* Added availability_template to Template Vacuum platform
* Added to test for invalid values in availability_template
* Updated AVAILABILITY_TEMPLATE Rendering error
* Moved const to package Const.py
* Removed 'Magic' string
* Cleaned up const and compare lowercase result to 'true'
* reverted _available back to boolean
* Fixed tests (async, magic values and state checks)
Gil Peeters
11c9bab078